one way to get Cranidos is going underground with the explorer kit and digging up a fosill and going to Orbourgh city and going to the long building on the right.
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There's one simple answer: trade! Cranidos is to Diamond as Shieldon is to Pearl, so find a friend who has Pearl and trade with them.
Cranidos is a Rock type Pokemon that can be revived from a Skull Fossil in Pokemon Diamond. It will evolve into Rampardos at level 30.30
Although many people are saying that Cranidos is only in Diamond, they are WRONG. (You do also get Sheildon, but I don't know if you can get sheildon in Diamond, however, I assume you can). I have encountered Cranidos many times, for example; JUST today I have seen three. More to the point, you can often find them in caves, or just outside caves. I hoped I have helped to answer your question, thank you.
Must trade Cranidos appears in Diamond/Platinum (odd ID number) - Revive Skull Fossil
use a fossil to get it in orburg